Abstract
Cotyledon explants of ginseng (Panax ginseng C. A. Meyer) produced somatic embryos directly on medium without growth regulators, with 89% of the explants forming somatic embryos. Cytokinin treatment greatly suppressed somatic embryo formation but stimulated the direct formation of adventitious buds. BAP treatment was more effective than the kinetin treatment for adventitious bud formation. Auxin (0.05 mg/l IBA) in combination with cytokinin enhanced adventitious bud formation, with the highest frequency, 40%, at 0.05 mg/l IBA and 5 mg/l BAP. Adventitious buds were mainly formed near the distal portion of the cotyledons, while somatic embryos were formed near the proximal excised margins. Shoots were developed from adventitious buds after transfer to MS medium with 10 mg/l GA3. Root formation from the shoots was obtained after the shoots were transferred to half-strength MS medium with auxin (IAA). When the plants derived from adventitious buds were transferred to greenhouse soil, 36% were successfully acclimatized.
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